Shell Programming and Scripting

In my quest to solve a bigger problem (See my previous post called "Create SQL DML insert statements from file using AWK or similar" - sorry, not allowed to post urls until I have > 5 posts) I'm trying to get my head round awk, but have some problem figuring out why the following script does work while the corresponding(?) one-liner does not?

Here is the script that works:

Code:

#! /usr/bin/awk -f

/^ ABC_/{
 g++
 f=$1
}
{ 
  print $0>f
}

It splits a large file into smaller files based on blocks of text starting with " ABC_". And it does work.

However, If I try to enter this as a one-liner like this:

Code:

awk '/^ ABC_/{g++ f=$1} {print $0>f}' largefile.txt

I get the following error:

Code:

awk: line 1: syntax error at or near =

Why? What is wrong with my one-liner?